What 393.1(c) means in plain language
393.1(c) requires that every commercial motor vehicle be equipped with safety and comfort devices that meet federal standards. This covers a broad range of vehicle components—from mirrors and seats to grab handles and windshields—that are designed to keep you safe and comfortable during operation.
The regulation isn't about performance or condition in the moment of inspection; it's about whether the required devices and equipment are present on the vehicle as built or maintained. If a device is missing entirely, or if it's been removed and not replaced, you're in violation. The intent is to ensure your truck has all the mandatory safety and comfort hardware that regulations require.
This code applies across all commercial vehicle classes and is typically cited during roadside inspections when an officer notices that a required device is absent or not installed according to spec.
What our enforcement data actually shows
Across our 13 million+ inspection records, 393.1(c) is cited very rarely. All-time, we see only 6 citations for this code in our database. In the last 12 months, there have been 0 citations, and in the last 90 days, 0 citations as well.
When this code is cited, it is not placed out-of-service eligible—meaning an inspector cannot remove your truck from service solely for this violation. Of the 6 citations in our records, 0 resulted in an out-of-service order, giving this code a 0.0% OOS rate. For comparison, the all-FMCSR average OOS rate is 31.4%, so 393.1(c) is significantly less likely to trigger an immediate pull-out than the typical violation.
Nationally, 393.1(c) ranks #2357 out of 3,036 FMCSR codes by citation volume. This places it in the lower tier of enforcement activity, suggesting that either compliance is widespread or enforcement focus is directed elsewhere.
Who gets cited most
Our inspection records do not show a geographic concentration of 393.1(c) citations. The violation is so infrequently cited that no single state dominates the enforcement picture. Similarly, citations are scattered across carriers; our data shows carriers such as Waste Management of Maryland Inc with 1 citation and Advanced Irrigation Incorporated with 1 citation, but no carrier exhibits a pattern of repeat violations for this code.
Vehicle makes cited include Peterbilt and Mack, each with 2 citations, along with single citations for Freightliner, Dodge, and utility vehicles. This distribution suggests the violation is sporadic and not tied to any particular manufacturer's design or quality issue.
How severe is this compared to similar codes
393.1(c) sits in the Vehicle Maintenance category, where severity varies widely. For perspective:
393.9(a) — Inoperable required lamps has been cited 660,737 times with a 15.4% OOS rate. This is a far more frequently enforced code, likely because lamp failures are easy to spot and directly affect visibility and safety.
396.3(a)(1) — Inspection/repair/maintenance (general) has 236,919 citations and a 45.3% OOS rate, making it both more common and much more likely to result in an out-of-service order.
396.17(c) — No proof of periodic inspection has 198,331 citations but a 0.0% OOS rate, like 393.1(c), because proof-of-inspection violations are documentary rather than safety-critical at the roadside moment.
The contrast is stark: 393.1(c) enforcement is orders of magnitude lower than comparable maintenance codes, and when it is cited, it carries no OOS risk.
How to avoid it
Since 393.1(c) covers the presence and installation of required safety and comfort devices, prevention hinges on a thorough pre-trip inspection and maintenance routine:
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Conduct a complete walk-around before every trip. Check that all required mirrors, grab handles, steps, seats, and interior safety equipment are in place and securely fastened. Look for missing hardware, loose fasteners, or signs that components have been removed.
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Know what your truck is supposed to have. Review your vehicle's manufacturer specifications and the FMCSR requirements for your truck class. If you've had repairs or modifications, confirm that all required devices were reinstalled.
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Secure any loose or rattling equipment. Vibration and wear can loosen bolts and fasteners over time. A monthly tightening pass on frequently accessed grab handles, mirrors, and seat hardware can prevent minor issues from becoming citations.
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Document your pre-trip checks. Keep records of your vehicle inspections. If cited, you'll have evidence that you were actively maintaining compliance.
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Report missing or damaged components to your fleet immediately. Don't defer repairs. If a required device is missing or broken, get it replaced before your next run. Your fleet should track these items and prioritize reinstallation.
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Pay special attention after any collision or significant maintenance. If your truck has been in a crash or had major work done, do an extra careful inspection to ensure all required equipment was replaced correctly.